Planothidium haynaldii
(Schaarschmidt) Lange-Bertalot 1999 Category: Monoraphid
BASIONYM: Achnanthes haynaldii Schaarschmidt 1881
SYNONYM(S): Planothidium lanceolatum var. haynaldii (Schaarschmidt) Bukhtiyarova | Achnanthes lanceolata var. haynaldii (Schaarschmidt) Cleve
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - March 2011
Length Range: 9-25 µm
Width Range: 4.8-7.0 µm
Striae in 10 µm: 14-15
Description
Valves are lanceolate to elliptical-lanceolate with capitate apices; specimens at the small end of the size range are nearly elliptical. The raphe valve has a linear axial area and central area that varies in shape - from transversely rectangular to elliptical. The rapheless valve has a linear-lanceolate axial area that slightly widens in the center. The asymmetrical central area on the rapheless valve contains a rimmed depression on the internal valve surface.The raphe is straight with expanded external proximal endings. Terminal raphe fissures are curved to the secondary valve side. The striae are multiseriate and radiate throughout both valves.
The original description of Achnanthes haynaldii did not include illustrations and type material has never been investigated, so the identity of this taxon is questionable. This page follows the concept presented in Patrick & Reimer (1966).
Original Description
Basionym: Achnanthes haynaldii
Author: Schaarschmidt 1881
Length Range: µm
Striae in 10 µm: 14
Original Description
A. minuta, solitaria vel 2-3 in fascias conjuncta, lateribus anguste linearibus, leniter genuflexis; valvis oblongo-ellipticis apicibus rotundatis, vel elliptico-lanceolatis sub polis leniter constrictis, medio inflatis, - vel cymbiformibus, medio valde tumidis, ventricosis, utroque fine porrectis, apicibus obsolete capitatis, rotundatis; nodulo centrali valvae inferioris lateraliter dilatato duam fasciam semitransversalem Vformem referent, linea media recta, striis transversis subradiantibus distinctis, subtilibus circa 140 in 100 μ.
Original Images
Cite This Page:
Potapova, M. (2011). Planothidium haynaldii. In Diatoms of the United States. Retrieved May 23, 2013, from http://westerndiatoms.colorado.edu/taxa/species/planothidium_haynaldii
Species: Planothidium haynaldii
Contributor: Marina Potapova
Reviewer: Rex Lowe
Image Credit: Marina Potapova
- Valves lanceolate to elliptical-lanceolate with capitate to subrostrate apices
- Valves 4.8-7.0 μm wide
- Rapheless valve with asymmetrical central area containing rimmed depression
Valves are lanceolate to elliptical-lanceolate with capitate apices, 9-25 μm long, 4.8-7.0 μm wide. Small specimens have subrostrate, rather than capitate apices. The asymmetrical central area on the rapheless valve contains a rimmed depression on the internal valve surface. The striae are multiseriate, radiate throughout both valves, 14-15 in 10 μm.
Compare
Planothidium haynaldii differs from P. lanceolatum by capitate valve apices. Small specimens of the two species, however, may not be distinguishable. The valve shape of P. haynaldii is similar to that of P. biporomum, which can be easily identified by its "cave" structure on rapheless valve, while P. haynaldii has a rimmed depression.
Planothidium lanceolatum
Planothidium biporomum
Citations
Lange-Bertalot, H. (1999). Neue Kombinationen von taxa aus Achnanthes Bory (sensu lato). Iconographia Diatomologica 6: 276-289.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Schaarschmidt, G. (1881). Specimen phycologiae aequatoriensis. Magyar Novenytani Lapok 5(50):17-24.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 155031